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package com.yahoo.example;
import com.yahoo.data.access.Inspectable;
import com.yahoo.data.access.Inspector;
import com.yahoo.prelude.query.WordItem;
import com.yahoo.processing.request.CompoundName;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.search.result.Hit;
import com.yahoo.search.searchchain.Execution;
import com.yahoo.search.searchchain.SearchChain;
import com.yahoo.tensor.MapTensorBuilder;
import com.yahoo.tensor.Tensor;
import java.util.Iterator;
import java.util.Map;
public class UserProfileSearcher extends Searcher {
public Result search(Query query, Execution execution) {
Object userIdProperty = query.properties().get("user_id");
if (userIdProperty != null) {
// Retrieve user profile...
Tensor userProfile = retrieveUserProfile(userIdProperty.toString(), execution);
// ... and add user profile to query properties so BlogTensorSearcher can pick it up
query.properties().set(new CompoundName("user_item_cf"), userProfile);
if (query.isTraceable(9)) {
String tensorRepresentation = userProfile != null ? userProfile.toString() : "";
query.trace("Setting user profile to :" + tensorRepresentation, 9);
}
}
return execution.search(query);
}
private Tensor retrieveUserProfile(String userId, Execution execution) {
Query query = new Query();
query.getModel().setRestrict("user");
query.getModel().getQueryTree().setRoot(new WordItem(userId, "user_id"));
query.setHits(1);
SearchChain vespaChain = execution.searchChainRegistry().getComponent("vespa");
Result result = new Execution(vespaChain, execution.context()).search(query);
// This is needed to get the actual summary data
execution.fill(result);
Hit hit = getFirstHit(result);
if (hit != null) {
Object userItemCf = hit.getField("user_item_cf");
if (userItemCf instanceof Inspectable) {
return convertTensor((Inspectable) userItemCf);
}
}
return null;
}
private Hit getFirstHit(Result result) {
Iterator<Hit> hiterator = result.hits().deepIterator();
return hiterator.hasNext() ? hiterator.next() : null;
}
private Tensor convertTensor(Inspectable field) {
MapTensorBuilder tensorBuilder = new MapTensorBuilder();
Inspector cells = field.inspect().field("cells");
for (Inspector cell : cells.entries()) {
MapTensorBuilder.CellBuilder cellBuilder = tensorBuilder.cell();
Inspector address = cell.field("address");
for (Map.Entry<String, Inspector> entry : address.fields()) {
String dim = entry.getKey();
String label = entry.getValue().asString();
cellBuilder.label(dim, label);
}
Inspector value = cell.field("value");
cellBuilder.value(value.asDouble());
}
return tensorBuilder.build();
}
}
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